ASoC: Intel: Add support for PM ops in bxt-rt298

We need card to be early suspended and late resumed, so use prepare and
complete for card suspend and resume.

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Senthilnathan Veppur <senthilnathanx.veppur@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/sound/soc/intel/boards/bxt_rt298.c b/sound/soc/intel/boards/bxt_rt298.c
index 8b956500414b..2ef33b113bb5 100644
--- a/sound/soc/intel/boards/bxt_rt298.c
+++ b/sound/soc/intel/boards/bxt_rt298.c
@@ -454,10 +454,33 @@ static int broxton_audio_probe(struct platform_device *pdev)
         return devm_snd_soc_register_card(&pdev->dev, &broxton_rt298);
 }
 
+/*
+ * we want the card to be suspend first and then platform driver. This
+ * allows the DAPM to tear down pipelines on suspend and then platform shuts
+ * down the DSP. For this use .prepare for suspending card
+ *
+ * Similarly, use complete to let DSP download firmware first and then sync
+ * DAPM and restore pipelines to DSP
+ */
+static void broxton_rt298_complete(struct device *dev)
+{
+        snd_soc_resume(dev);
+}
+
+static const struct dev_pm_ops broxton_pm_ops = {
+        .prepare = snd_soc_suspend,
+        .complete = broxton_rt298_complete,
+        .freeze = snd_soc_suspend,
+        .thaw = snd_soc_resume,
+        .poweroff = snd_soc_poweroff,
+        .restore = snd_soc_resume,
+};
+
 static struct platform_driver broxton_audio = {
         .probe = broxton_audio_probe,
         .driver = {
                 .name = "bxt_alc298s_i2s",
+                .pm = &broxton_pm_ops,
         },
 };
 module_platform_driver(broxton_audio)